Expansion-mandrel



E. G. RIDER.

EXPANSION MANDREL. APPLICATION EILED JAN.24, 191 9.

Patented Jan. 6, 1920.

nuemtoz ERNEST G. RIDER @tto'muu ERNEST G. RIDER, or HiLAnEnrHiA,PENNSYLVANIA, nssienort'ro se ments ,7

MACHINE COMPANY, OF PHILADELPHIA,

PENNSYLVANIA.

EXPANSION-MANDREL.

Specification of Letters Patent.

PENNSYLVANIA, A. council-{ rron or Application filed :ranil r 24,1919.Serial No. 272,847.

To all whom it may concern:

Be it known that I, ERNEST Gr. RIDER, a citizen of the United States,residing in Philadelphia, Pennsylvania, have invented certainImprovements in Exp'ansioirMandrels, of which the following is aspecification.

My invention relates to expansion mandrels, such, for instance, as areused to hold cardboard tubes upon which yarn is being wound, the objectof my invention being to construct a mandrel of this type in such a waythat it may be readily caused to grip the tube and prevent rotationthereof, to release the same for removal, or to grip the tube in such away as will prevent rotation thereof in one direction but permit it inthe reverse direction.

This object I attain in the manner hereinafter set forth, referencebeing had to the accompanying drawing, in which Figure 1 is a top orplan View of a mandrel constructed in accordance with my invention;

Fig. 2 is a vertical section of the same on the line 22, Fig. 1, and

Fig. 3 is a View, similar to Fig. 2, but illustrating the parts in theirexpanded positions.

A mandrel embodying the features of my invention consists primarily of atubular body 1, within which is rotatably mounted a rod 3. One end ofthe tubular body 1 is preferably expanded, as at 4:, to properly centerthe cardboard tube when it is applied to the mandrel, and the oppositeend of the rod 3 is preferably provided with a knurled or roughened head5 by which it maybe readily grasped and rotated.

The tubular body 1 is, at intervals, slotted to form spring fingers 6and the rod 3 is, at similar intervals, provided with notches 7 intowhich project inturned ends 8 of the spring fingers 6.

When the rod 3 occupies the position in reference to the tubular body 1shown in Fig. 2, the spring fingers 6 are flush with the outer face ofthe tubular body and a cardboard tube 00 may be readily slipped intoposition over the mandrel. As soon as the tube :0 is in'position, therod3 is rotated and the action of the notches 7 upon the ends 8 of thespring fingers 6 forces said the reverse direction.

between the spring fingers '6,to form lugs 9,

which, when struck up, as shown in Figs. 2 and 3, present, in onedirection, inclined faces 9, and, in the opposite direction, abruptfaces 9 When the spring fingers 6 are expanded, as shown in Fig. 3, theydraw the inner face of the tube a: against the lugs 9v and, while thetube 0'5 may rotate in the direction of the arrow at any attempt torotate the tube in the reverse direction will be prevented by the abruptfaces 9 of Patented Jan. 6, 1920.

spring fingers outwardly until they securely the lugs 9 which will biteintothe inner face of the tube. It is, of course, understood that whenthis mounting of the tube 00 is desired, the spring fingers 6 areexpanded merely enough to cause the inner face ofthe tube to bearagainst the lugs 9, but notsufficiently to cause said spring fingers togrip the inner face of the tube with such force as will prevent rotationthereof in either direction.

In order to control the degree of rotation, in either direction, ofwhich the rod 3v is capable, said rod has, projecting from it, pins 10(Fig. 1) which engage with slots 11 in the tubular body 1. Contact ofthe pins with the ends of theseslots serves to prevent too great anamount of rotation, in either direction, of the rod 3 within the tubularbody 1.

I claim: 7

1. The combination, in a mandrel, of a tubular body slotted to form aspring finger integral with said tubular body, and means containedwithin said tubular body and coacting with said integral spring fingerto project the same outwardly.

2. The combination, in a mandrel, of a tubular body, a spring fingerthereon, a

rod rotatably mounted therein, and means whereby said rod, when rotated,is caused to act upon said Spring finger so as to project the sameoutwardly.

'3. The combination, in a mandrel, of a tubular body slotted to form aspring finger, and a notched rod rotatably mounted in said tubular body,said spring finger having an ingurned end engaging the notch in said r0I 1 r 4:. The combination, in a mandrel, 'of a body, a spring fingerthereon, means for 3 pro ecting said spring finger outwardly, and

a longitudinally disposed lug on said body, said lug presenting in onedirection an inclined face and in the other direction an abrupt face.

5. A mandrel having a tubular body slotted at one point to form a springfinger and at another point to form alug which has an inclined face andan abrupt face.

6. The combination, in a mandrel, of a tubular body slotted at one pointto form a spring finger and at another point to form a lug, and meansfor projecting said "spring finger outwardly, said spring fingerbeing solocated'in respect to said lug that, when projected, its point ofgreatest projection is substantially diametrically opposite the position of the lug.

7. An expansion mandrel having upon its outer face a longitudinallydisposed lug, said lug presenting in one directionan inclined face andin the other direction an abrupt face.

Intestimony whereof, I have signed my name to this-specification.

ERNEST G. RIDER.

